I think there is a bit of a situation on this thread where posters who's DC are not working hard enough are banding together to reassure each other that it is ok, it is completely normal, etc.
Yes it is normal for teens who are heading to crash and burn, then spend the rest of their lives bemoaning the fact they couldn't get the job they wanted.
As a teacher, I see the whole spectrum. Teens coasting along with parents who think the suggestion that they do an appropriate amount of work is funny.
Teens who work hard and reliably
Teens who work too hard! ( yes, we get those too, sometimes with parents who are pushing them, sometimes with parents who are concerned and trying to make them take breaks)
Of course it is the second group who reach their potential. Not everyone is going to be capable of As, but obviously you want everyone to gt the maximum grades they can, and be in the best position to have choices over the next stage of their lives.
Why would teens be doing anything OTHER THAN revision over half term, it is the most intense period for revision, many schools are open, (often for weaker students, the most motivated will be capable of organising and motivating themselves)
Half of their waking hours is sensible, organised, with a timetable of subjects, targets, breaks and treats. These are the students who will in the end have the power and choices in their adult lives.
It may make you feel safer to gang up and laugh at Begging but she is the one on the money here.